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If you have been practicing unprotected sex from 8th nov and she had spotting on the 23rd nov,it is likely that she may have had an implantation bleed secondary to conception.
However, the pregnancy can be confirmed by either blood serum hcg test where hcg levels are high or a urine pregnancy test may be done 7 days after the missed periods to confirm pregnancy.
I hope i have answered your query in detail.
wishing you good health.
regards

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